SNOW-3718303: Correctly escape special characters in comment/collate/subfield/flatten SQL

[sfc-gh-aling]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-3718303, SNOW-3718304, SNOW-3718305, SNOW-3718306

Values passed to DataFrame comment (create_or_replace_view / dynamic table / save_as_table), Column.collate, Column.getitem subfield keys, and DataFrame/Session.flatten PATH were concatenated into SQL string literals without escaping backslashes (and, for collate/subfield/flatten, single quotes), so values containing those characters produced invalid SQL. Adds a dedicated escape_quotes_and_backslashes helper applied only at those sinks; the shared escape_single_quotes is unchanged so other callers are unaffected. Column.collate keeps its pre-quoted-spec handling so legitimate specs behave identically. Adds unit and integ tests.

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
   • I acknowledge that I have ensured my changes to be thread-safe. Follow the link for more information: Thread-safe Developer Guidelines
   • If adding any arguments to public Snowpark APIs or creating new public Snowpark APIs, I acknowledge that I have ensured my changes include AST support. Follow the link for more information: AST Support Guidelines

3. Please describe how your code solves the related issue.

   Please write a short description of how your code change solves the related issue.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.52%. Comparing base (e773089) to head (98645b0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4271   +/-   ##
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  Coverage   95.52%   95.52%           
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  Files         171      171           
  Lines       44305    44358   +53     
  Branches     7565     7577   +12     
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+ Hits        42322    42375   +53     
  Misses       1221     1221           
  Partials      762      762           

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